.fullScreen{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.client-sign-box{
   width: 100px;
   height: 100px;
   background-color: aqua;
}